Set /SUBSYSTEM down to 5.02 on x64 to more closely match x86

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 2951 matching lines @@
             'TargetMachine': '1',
           },
         },
         'msvs_configuration_platform': 'Win32',
       },
       'x64_Base': {
         'abstract': 1,
         'msvs_configuration_platform': 'x64',
         'msvs_settings': {
           'VCLinkerTool': {
+            # Make sure to understand http://crbug.com/361720 if you want to
+            # increase this.
+            'MinimumRequiredVersion': '5.02',  # Server 2003.
             'TargetMachine': '17', # x86 - 64
             'AdditionalLibraryDirectories!':
               ['<(windows_sdk_path)/Lib/win8/um/x86'],
             'AdditionalLibraryDirectories':
               ['<(windows_sdk_path)/Lib/win8/um/x64'],
             # Doesn't exist x64 SDK. Should use oleaut32 in any case.
             'IgnoreDefaultLibraryNames': [ 'olepro32.lib' ],
           },
           'VCLibrarianTool': {
             'AdditionalLibraryDirectories!':
@@ skipping 2440 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }